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G. v. ROWDEN. DAYLIGHT DEVELOPING TANK FOR PHOTOGRAPHIC ROLL FI LMS.

APPLICATION FILED JAN. 28, 1921 Patented July 18, 1922.

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ma Z/WM UNITED STATES PATENT OFFICE.

GEORGE VERE ROWDEN, OF HOVE, ENGLAND.

Specification of Letters Patent.

Patented July 18, 1922.

Application filed Ianuary 28, 1921. Serial No. 440,788.

To all whom it may concern.

Be it known that I, GEORGE VERE Row- DEN, a subject of the King of Great Britain and Ireland, residing at 49 WVestbourne Gardens, Hove, in the county of Sussex, England, have invented a new and useful Improvement in Daylight Developing Tanksv tank, and it has for its object facilitating the movement of the slide in relation both to the tank and to the film whereby all undue strain. is removed from the film and any tendency for the two sections of the films to come together is avoided.

I attain this end by constructing the slide of two members adapted to pass through the cap ofthe tank and by the employment of rollers on a bar carried by the inner ends of t-hesliding members, one or more of said rollers being adapted to form the part of the slide which engages the fold of the film and two of said rollers being adapted to engage guides of a channel form on the inner faces of the sides of the tank. y

In the accompanying drawing which illustrates this invention Fig. 1 is a view in front elevation, partly in section, of a tank embodying the present invention with both the cap and the slide partly raised, and

Fig. 9 is a view in, sectional side elevation with the cap and the slide pushed. completely home.

In both views like parts are marked with like letters of reference.

The slide consists of two members a and a adapted to passthrough suitable bearings b and Z2 carried by the cap a of the tank a. The outer ends of these two members a are connected by a bar d which forms a handle whereby the slide can be operated. The inner ends of the members a carry a bar 6 the ends of which engage through rollers m and m as shown in the accompanying drawing, with guides which take the form of channels a, n formed by ribs on the inner faces of the sides of the tank. On the central part of this bar 6 is mounted a roller 7 around which the film 0: passes. I 1

Two rollers 0 and 0 are mounted in the tank near its upper part to serve as guides for keeping the two layers of the films in approximately parallel relation to one another.

The supports of the roller a carrying the exposed film may be of the usual or any other suitable construction.

The free end (10 of the film is held fast in relation to the tank by placing it over the top edge c of the tank 0 andplacing the cap or lid 0 in position in the well-known manner.

To enable the developing fluid to be agitated during the developing process a blowpipe r may be provided and connected to the lower part of the tank.

lVhat I claim is 17- 1. A daylight developing tank for roll films comprising a tank having a pair of opposed guides on its inner walls, a cap adapted to close said tank, a support for the roll of film within said tank, and a feed ingslide consisting of two members adapted to slide through the cap of the tank, a connection between the outer ends of said members, a bar carried by the inner ends of said members, one or more rollers mounted on said bar between said members and rollers mounted on the ends of said bar exterior to said members and adapted to engage the guides in the tank.

2. A daylight developing tank for roll films comprising a tank having a pair of opposed guides on. its inner walls, a cap adapted to close said tank, a support within said tank for the roll of films, a feeding slide consisting of two members adapted to slide through the cap of the tank, a handle carried by the outer ends of said members, a bar carried by the inner ends of said members, one or more rollers mounted on said bar between said members and rollers mounted on the ends of said bar exterior to terior to the path of said feeding slide.

GEORGE VERE ROWDEN. 

